Allow generate schemes to generate task/function definitions.

Generating task/function definitions involves getting the functions
to put themselves into the generate scheme instead of the module,
and getting elaboration to elaborate those definitions in the
generate scheme.

Module.cc

@@ -41,16 +41,6 @@ void Module::add_gate(PGate*gate)
       gates_.push_back(gate);
 }
 
-void Module::add_task(perm_string name, PTask*task)
-{
-      tasks_[name] = task;
-}
-
-void Module::add_function(perm_string name, PFunction *func)
-{
-      funcs_[name] = func;
-}
-
 unsigned Module::port_count() const
 {
       return ports.count();